Proven (4)
I believe the answer is:
true
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">proven</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for true that I've seen before include "Factually correct" , "Rightly so called" , "Loyal; authentic" , "Real; accurate" , "Straight or loyal" .)